Preheat your oven to 400°F (200°C) and line a small baking sheet with parchment paper for easy cleanup.
In a shallow dish, whisk the egg until smooth. In a separate shallow bowl, combine the almond flour, parmesan cheese, garlic powder, oregano, sea salt, and black pepper.
Dip the chicken breast into the egg wash, then press it firmly into the parmesan mixture until it is evenly coated on all sides.
Place the coated chicken on the prepared baking sheet, drizzle with olive oil, and bake for 20-25 minutes until the crust is golden and the internal temperature reaches 165°F.
While the chicken is roasting, spiralize the zucchini into noodles and lightly sauté them in a non-stick pan over medium heat for 2-3 minutes until just tender.
Warm the marinara sauce in a small saucepan over low heat until simmering.
Arrange the zucchini noodles on a plate, place the crispy chicken on top, and finish with a generous pour of the warm marinara sauce.